Pump-valve and valve-actuating mechanism.



No. 724,497. 1 rATENTED APR. 7', 1903.

G. B. PBTSCHE.

PUMP VALVE AND VALVE AGTUATING MGHANISM. I AyPLIo'AfrIoN FILED JULY 31. 1897.

' No MODEL Ffj.

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UNrrueDY YSTATES PATENT Orrrcn.

GUSTAV BERNHARD PETSCHE, OF PHILADELPHIA, PENNSYLVANIA, AS-

SIGNORY TO Tl-IE vSOUTHVVARK FOUNDRY dt MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

F'Ulvl P-vALvE AND VALVE-ACTUA1-iNeV MECHANISNI.

sPEorFioATIoN forming pm of Letters Patent No. 724,497, dated April 7, 190e.

Applioatiunfled July 31,1897. Serial No. 646,633. (No model.)

To all whom it' may concern: Y

Be it known that I, GUsTAv BERNHARD PETSOHE, a subject'of the Emperor .of Germany, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented a certain new and useful Improve-v ment in Pump-Valves and Valve-Actuating Mechanism, of which the following is a true and exact description, reference being had to ro the accompanying drawings, which form a part thereof. '.My invention relates to the construction and operation of valves especially devised and arranged for use as a suction or delivery valve of a liquid-pump, but adapted for use as well in air-pumps or similar mechanism.

The object of my invention isV to provide a pump-valve which Will embody to a large eX- tent the good qualities of the rotary and slide zo valve types; and, generally speaking, my invention may be said to consist in' combining with the p'ort of a pump an eocentrically-pivoted rotary valve arranged to face the flow of fluid through its port and in combining with such a valve means for applying a yielding pressure to open and preferably, also, to closeV the valve.

Reference is now had to the drawings in which my invention is illustrated, and in Which- Figure l is a sectional side elevation of a portion ofa pump provided with my improved valve and valve-actuating mechanism. Fig. 2 shows the same valve in the open position, and Fig. 3 is a sectional View illustratinga modiication in the valve-actuating mechanism.

As shown in Figs. l and 2, the valve is arranged to serve the purpose of a suction-valve, A indicating the pump-chamber, and B the 4o suction-chamber, of the pump.

C is the seat of the valve, which of course is curved to conform to thesegmental section of the valve-face.

D indicates the valve, which, as shown, is of a gridiron type, having four bars to cover the four port-openings in the valve-seat, D indicating the center of pressurethat is to say, the point at which the lines of pressure extending through each of the bars of the valve 5o meetwhile D2 indicates the pivotal center of the valve, which, as shown, is eccentric. Obviously, therefore, pressure acting on the face of the valve when it is closed will tend to open the valve, acting with a leverage equal to the distance between the centers D and D2.Y In the same way pressure acting upon the back of the valve will tend .to close it, turning the valve backward in the direction to seat it. The opening of the valve is accomplished by a slight movement of the 6o' valve-stem, practically such as would be necessary to open anl ordinary rotary valve of the same type, and the eect of opening the valve is indicated in Fig. 2, where the valve is shown as moved laterally, so as to leave a free passage through the ports, which it closes and at the same time moves lslightly away from its seat.

I actuate the valve by some means by which a yielding pressure is transmittedto it at 7o proper intervals, so that in case the pressure to open the valve is applied before the pressure upon its face and back is equalized the pressure `upon its back will tend to hold it to its seat until the pressure upon its face substantially or nearly counterbalances the back pressure, which pointis, of course, the proper. timefor a pump-valve to open. The means shown in Fig. l for actuating the valve in this Way consist of a divisional cylinder, two 8o parts of whichareindioated at I and I and are separated by an inwardly-extending flange or perforated plate H, the opening H' in which is of considerably greater area than the valvestem connecting the two pistons working in the cylindersections. An opening H2 is formed through the' plate H and regulated by means of a plug or cock H3, and preferably bypasses H4 H5 connect the two cylinder-sections, leading in each case from a point 4on the side 9o of one cylinder-section which Vwill be closed by the piston to a point in the other cylini der-section which will not be affected by the piston, and in each of these by-passes I place a nonreturn valve H6. G and G' indicate 95 connected pistons, one working in each of the cylinder-sections, and up'on the innerface of each piston I secure a short plunger, as g or g', adapted to fit neatly in the perforation of the plate H and close it, so that water Will no roo longer pass through it when the plunger is in coaction with it. 1I and t" are the ports leading to the cylinder-sections I and I and to a valve-chamber J, into which chamber also leads a port K' from a source of fluid under pressure (indicated at K) and exhaust-ports L and L2, connecting with an exhaust-opening L. M is a piston-valve working in the valve-chamber J and regulating the admission and exhaust of the pressure fluid to the ends of the cylinder. It will be seen at once that the motions of the pilot-valve M Will control the motions of the pistons G and G', and through them the motions of the valve D, and that the pressure applied to open or close the valve will be a yielding pressure determined by the pressure under which the motive fluid is supplied, also that the special construction of cylinder which I have described provides a device in the nature of a dash-pot, by which the momentum of the valve in opening and closing is overcome and rendered innoxious, while the by-passes H4 H5 prevent the plungers g and g from retarding the beginning of motion inthe valve, permitting the fluid to flow from in front of an inwardly-moving piston to the face of the outwardly-moving piston Without having to pass through the opening H2.

In Fig. 3 I have shown the valve-actuating 'rod E as connected with the lever-arm D3 through the medium of springs N and N', so that a positive motion given to the rod E will impart an elastic or yielding impulse to the valve-actuating lever, enabling it to operate in much the same Way, generally speaking, as where the actuating-cylinder is used, as shown in Fig. 1.

4 Thevalve-actuating cylinder,with its dashpot feature and also the arrangement of spr-ings shown in Fig. 3, are not specifically claimed in this application except in combination with the eccentrically-pivoted rotary valve, as in other applications filed by me I have shown and described the same mechanism for acting upon pump-valves with a yielding pressure and have claimed the same `so far as I believe it to be new, said applications being those on which Patents No. 632,744, of September 12, 1899, and No. 647,153, of April 10, 1900, have issued and the pending application, Serial No. 646,629, filed July 31, 1897.

Having now described my invention, What I claim as new, and desire to secu re by Letters Patent, isA

1. In combination with a pump an eccentrically-pivoted rotary valve seated to face the flow of liquid through its port and means for acting on said valve to open it with a yielding pressure.

2. In combination With a pump having a port or ports provided with a concavelycurved grid-valve seat facing in the direction in 'which the fluid Hows through the port, an eccentrically pivoted rotary valve having grid-bars adapted to close the valve-seated port aforesaid and its pivot arranged, as described so that it opens the 'port by a simultaneous lateral and lifting action and means for acting on said valve to 'open it with a yielding pressure.

GUSTAV BERN HA RD PE'ISCHE.

Witnesses:

CEAS. F. MYERS, D. STEWART. 

